Assessment of groundwater quality using statistical methods in the Isly basin (Horst Belt, Morocco)Soufiane Ziani, Driss Khattach, Jamila Abderbi, Nordine Nouayti and Mohamed MakkaouiE3S Web Conf., 240 (2021) 01009DOI: https://doi.org/10.1051/e3sconf/202124001009